// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#pragma once

#include <memory>
#include <shared_mutex>
#include <unordered_map>

#include "io/fs/file_system.h"

namespace doris {
namespace io {

class FileSystemMap {
public:
    static FileSystemMap* instance();
    ~FileSystemMap() = default;

    void insert(ResourceId id, FileSystemPtr fs);

    // If `id` is not in `_map`, return nullptr.
    FileSystemPtr get(const ResourceId& id);

private:
    FileSystemMap() = default;

private:
    std::shared_mutex _mu;
    std::unordered_map<ResourceId, FileSystemPtr> _map; // GUARED_BY(_mu)
};

} // namespace io
} // namespace doris
